R
ryandavenport
Guest
The most useful straps are the nylon webbing that stretches and snaps back...snatch straps. They are looped at both ends, no hooks to fly through the air and kill people, etc.
I find the most useful size is 30' x 3"...you rarely are giving a yank from further than that, but, you don't want to be THAT close either....to avoid yanking them into YOUR rig, etc...and the 3" width strap is rated for 30k lb.
As force = mass times acceleration, and, lets say your 5k lb rig is going 10 mph to yank the guy from that mud hole he's sunk to his frame rails in...
5,000 lb x 10 mph = 50,000 lbmph
I think that's a bit OVER over 20k lb of force....so, upping to a stronger strap that can take 30k lb is wise/safer.
This is why those recovery HOOKS rated for 10k lb get ripped OFF on a hard yank sometimes....the physics is brutal.
The straps are MOST useful if you also have recovery points on the front and rear of your rig, to ATTACH the strap TOO.
This math is terrible in terms of units, but it can slide since you got your point across lol. You would need acceleration of the vehicle being pulled out in ft/s or m/s. That would give you units of lb-ft/s^2 or N.